Patch "[PATCH] esp4: Fix udpencap for local TCP packets." has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

[PATCH] esp4: Fix udpencap for local TCP packets.

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
esp4-fix-udpencap-for-local-tcp-packets.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Steffen Klassert <[email protected]>
Date: Fri, 9 Jun 2017 11:35:46 +0200
Subject: [PATCH] esp4: Fix udpencap for local TCP packets.

From: Steffen Klassert <[email protected]>

[ Upstream commit 0e78a87306a6f55b1c7bbafad1de62c3975953ca ]

Locally generated TCP packets are usually cloned, so we do skb_cow_data() on this packets. After that we need to reload the pointer to the esp header. On udpencap this header has an offset to skb_transport_header, so take this offset into account.

This is a backport of:
commit 0e78a87306a ("esp4: Fix udpencap for local TCP packets.")

---
 net/ipv4/esp4.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

index b1e2444..9708a32 100644
@@ -212,6 +212,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	u8 *iv;
 	u8 *tail;
 	u8 *vaddr;
+	int esph_offset;
 	int blksize;
 	int clen;
 	int alen;

@@ -392,12 +393,14 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	}
 
 cow:
+	esph_offset = (unsigned char *)esph - skb_transport_header(skb);
+
 	err = skb_cow_data(skb, tailen, &trailer);
 	if (err < 0)
 		goto error;
 	nfrags = err;
 	tail = skb_tail_pointer(trailer);
-	esph = ip_esp_hdr(skb);
+	esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
 
 skip_cow:
 	esp_output_fill_trailer(tail, tfclen, plen, proto);

2.9.4



Patches currently in stable-queue which might be from [email protected] are

queue-4.11/xfrm-oops-on-error-in-pfkey_msg2xfrm_state.patch
queue-4.11/xfrm-move-xfrm_garbage_collect-out-of-xfrm_policy_flush.patch
queue-4.11/xfrm-fix-stack-access-out-of-bounds-with-config_xfrm_sub_policy.patch
queue-4.11/xfrm-null-dereference-on-allocation-failure.patch
queue-4.11/esp4-fix-udpencap-for-local-tcp-packets.patch
queue-4.11/xfrm6-fix-ipv6-payload_len-in-xfrm6_transport_finish.patch